Calculator Inputs
Select a method below. You can compute β from fluxes, from gradients, from two-level temperature and humidity, or use β with Rn and G to estimate fluxes.
Formula Used
- Flux method:
β = H / LE - Gradient method:
β = γ · (ΔT / Δe) - Profile method: compute
e = RH · es(T), thenβ = γ · (ΔT / Δe) - Partition method: with
A = Rn − G,LE = A / (1 + β),H = β · LE
The profile method uses saturation vapor pressure es(T) from a standard exponential relation. γ can be entered directly or estimated from pressure using γ = 0.000665 · P(kPa).
How to Use This Calculator
- Select one method from the dropdown.
- Choose γ as manual or pressure based.
- Enter values with correct units and signs.
- Press Calculate to see results above.
- Export the calculation using CSV or PDF.
Example Data Table
These examples illustrate typical use cases and outcomes.
| Scenario | Method | Inputs | Primary output | Meaning |
|---|---|---|---|---|
| Moist surface | Flux | H = 80 W/m², LE = 320 W/m² | β = 0.25 | Latent dominates; strong evaporation. |
| Dry afternoon | Flux | H = 250 W/m², LE = 90 W/m² | β = 2.78 | Sensible dominates; limited moisture. |
| Measured gradients | Gradient | γ = 0.066, ΔT = 1.2°C, Δe = 0.15 kPa | β = 0.528 | Latent larger, with notable sensible heating. |
| Two-level sensors | Profile | T1 = 29°C, RH1 = 55%, T2 = 27°C, RH2 = 45% | β from computed Δe | Uses humidity and temperature at two levels. |
| Energy balance split | Partition | β = 0.4, Rn = 520 W/m², G = 60 W/m² | H and LE estimates | Provides flux estimates from available energy. |